Buggy code:
public final class MainPanel extends JPanel implements SearchListener < TextTag > , Freed , ActionListener , TreeSelectionListener { private final MainFrame mainFrame ; private final List < SWFList > swfs ; private ABCPanel abcPanel ; private ActionPanel actionPanel ; private final JPanel welcomePanel ; private final TimelineViewPanel timelineViewPanel ; private final MainFrameStatusPanel statusPanel ; private final MainFrameMenu mainMenu ; private final JProgressBar progressBar = new JProgressBar ( 0 , 100 ) ; private DeobfuscationDialog deobfuscationDialog ; public TagTree tagTree ; public DumpTree dumpTree ; private final FlashPlayerPanel flashPanel ; private final JPanel contentPanel ; private final JPanel displayPanel ; public FolderPreviewPanel folderPreviewPanel ; private boolean isWelcomeScreen = true ; private static final String CARDPREVIEWPANEL = "Preview<seq2seq4repair_space>card" ; private static final String CARDFOLDERPREVIEWPANEL = "Folder<seq2seq4repair_space>preview<seq2seq4repair_space>card" ; private static final String CARDEMPTYPANEL = "Empty<seq2seq4repair_space>card" ; private static final String CARDDUMPVIEW = "Dump<seq2seq4repair_space>view" ; private static final String CARDACTIONSCRIPTPANEL = "ActionScript<seq2seq4repair_space>card" ; private static final String CARDACTIONSCRIPT3PANEL = "ActionScript3<seq2seq4repair_space>card" ; private static final String CARDHEADER = "Header<seq2seq4repair_space>card" ; private static final String DETAILCARDAS3NAVIGATOR = "Traits<seq2seq4repair_space>list" ; private static final String DETAILCARDEMPTYPANEL = "Empty<seq2seq4repair_space>card" ; private static final String SPLIT_PANE1 = "SPLITPANE1" ; private static final String WELCOME_PANEL = "WELCOMEPANEL" ; private static final String TIMELINE_PANEL = "TIMELINEPANEL" ; private final JSplitPane splitPane1 ; private final JSplitPane splitPane2 ; private boolean splitsInited = false ; private JPanel detailPanel ; private JTextField filterField = new MyTextField ( "" ) ; private JPanel searchPanel ; private final PreviewPanel previewPanel ; private final HeaderInfoPanel headerPanel ; private DumpViewPanel dumpViewPanel ; private final JPanel treePanel ; private TreePanelMode treePanelMode ; private AbortRetryIgnoreHandler errorHandler = new GuiAbortRetryIgnoreHandler ( ) ; private CancellableWorker setSourceWorker ; public TreeItem oldItem ; private SearchDialog searchDialog ; private SearchDialog replaceDialog ; public static final String ACTION_SELECT_BKCOLOR = "SELECTCOLOR" ; public static final String ACTION_REPLACE = "REPLACE" ; public static final int MORPH_SHAPE_ANIMATION_LENGTH = 2 ; public static final int MORPH_SHAPE_ANIMATION_FRAME_RATE = 30 ; private static final Logger logger = Logger . getLogger ( MainPanel . class . getName ( ) ) ; public void setPercent ( int percent ) { } public void hidePercent ( ) { } public MainFrame getMainFrame ( ) { } private static void addTab ( JTabbedPane tabbedPane , Component tab , String title , Icon icon ) { } public void setStatus ( String s ) { } public void setWorkStatus ( String s , CancellableWorker worker ) { } private JPanel createWelcomePanel ( ) { } private JPanel createFolderPreviewCard ( ) { } private JPanel createDumpPreviewCard ( ) { } public String translate ( String key ) { } public MainPanel ( MainFrame mainFrame , MainFrameMenu mainMenu , FlashPlayerPanel flashPanel ) { } public void load ( SWFList newSwfs , boolean first ) { } private ABCPanel getABCPanel ( ) { } private void ensureActionPanel ( ) { } private ActionPanel getActionPanel ( ) { } private void updateUi ( final SWF swf ) { } private void updateUi ( ) { } public void closeAll ( ) { } public void close ( SWFList swfList ) { boolean modified = false ; for ( SWF swf : swfList ) { if ( swf . isModified ( ) ) { modified = true ; } } if ( modified ) { <START_BUG> if ( ( View . showConfirmDialog ( this , translate ( "message.confirm.close" ) . replace ( "{swfName}" , swfList . name ) , translate ( "message.warning" ) , JOptionPane . OK_CANCEL_OPTION , showCloseConfirmation , JOptionPane . CANCEL_OPTION ) ) == ( JOptionPane . CANCEL_OPTION ) ) { <END_BUG> return ; } } swfs . remove ( swfList ) ; if ( ( abcPanel ) != null ) { for ( SWF swf : swfList ) { if ( ( abcPanel . swf ) == swf ) { abcPanel . clearSwf ( ) ; } } } if ( ( actionPanel ) != null ) { actionPanel . clearSource ( ) ; } oldItem = null ; previewPanel . clear ( ) ; updateUi ( ) ; refreshTree ( ) ; } public void enableDrop ( boolean value ) { } public void updateClassesList ( ) { } public void doFilter ( ) { } @ Override public void setVisible ( boolean b ) { } public void renameIdentifier ( SWF swf , String identifier ) throws InterruptedException { } public void renameMultiname ( List < ABCContainerTag > abcList , int multiNameIndex ) { } public List < TreeItem > getASTreeNodes ( TagTree tree ) { } public boolean confirmExperimental ( ) { } public List < File > exportSelection ( AbortRetryIgnoreHandler handler , String selFile , ExportDialog export ) throws IOException { } private static void getASMs ( TagTreeModel ttm , TreeItem node , List < TreeItem > nodesToExport , boolean exportAll , List < ASMSource > asmsToExport ) throws IOException { } public List < SWFList > getSwfs ( ) { } public SWFList getCurrentSwfList ( ) { } public SWF getCurrentSwf ( ) { } public void gotoFrame ( int frame ) { } public void gotoDocumentClass ( SWF swf ) { } public void disableDecompilationChanged ( ) { } private void clearAllScriptCache ( ) { } public void searchInActionScriptOrText ( boolean searchInText ) { } public void replaceText ( ) { } private boolean searchText ( String txt , boolean ignoreCase , boolean regexp , SWF swf ) { } @ Override public void updateSearchPos ( TextTag item ) { } private void setDumpTreeSelectedNode ( DumpInfo dumpInfo ) { } public void setTagTreeSelectedNode ( TreeItem treeItem ) { } public void autoDeobfuscateChanged ( ) { } public void renameOneIdentifier ( final SWF swf ) { } public void exportFla ( final SWF swf ) { } public void importText ( final SWF swf ) { } private String selectExportDir ( ) { } public void export ( final boolean onlySel ) { } public void restoreControlFlow ( final boolean all ) { } public void renameIdentifiers ( final SWF swf ) { }

Fix:
if ( ( View . showConfirmDialog ( this , translate ( "message.confirm.close" ) . replace ( "{swfName}" , swfList . toString ( ) ) , translate ( "message.warning" ) , JOptionPane . OK_CANCEL_OPTION , showCloseConfirmation , JOptionPane . OK_OPTION ) ) == ( JOptionPane . CANCEL_OPTION ) ) {